Improvement in locks



UNITED STATES PATENT OEEIoE.

A. B. MULLETT, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 59,628, dated November13, 1866.

To all whom it may concern:

Be it known that I, A. B. MULLETT, of Washington, District of Columbia,have invented a new and useful Improvement in Locks; and I do herebydeclare that the following is a full7 clear, and exact description ofthe construction and operation thereof, reference being had to theannexed drawings, making a part of this specication, in Which- Figures land 6 are diii'erent views of Johnsons rotary lock-key. Figs. 2, 3, 7and S are different views of my improvement thereof. Fig. 5 represents aportion of the door and a section of the key-hole. Fig. irepresents theplate through which the end of the key is i11- serted, and back of whichit revolves.

The object ot' my invention is so to construct this plate and the end ofthe key that when the door is unlocked the key, instead ot' slippingfrom its place, hasa hold on this plate, by means of which the door maybe drawn open by the key Without an additional knob.

The construction is obvious from a glance at the drawings, and need notbe minntely described. The plate on the end of Johnsons key, in whichthe pins are fixed, is a cylinder, and hence there is nothing to holdthe key in place When revolved.

My improvement consists in the addition of the plate, Fig. 4, with itspeculiar key-hole, and in the key correspoliding thereto, so that whenthe lock is sprung the key remainsxed in place to draw open the door.

It is manifest that this may be done in various Ways by making the endof the key oval, or of any other regular or irregular form, eX- cept acylinder; or it may be done by attaching lugs 011 the circumferenceofthe cylinder.

What I claim as my improvement on said rotary lock, and desire to secureby Letters Patent, is-

The plate, Fig. 4, and its corresponding key, Figs. 2 and 8, made andcombined substantially as herein-set forth.

A. B. MULLETT.

Witnesses:

B. OERTLY, SAME. F. GARR.

